Asus ROG CROSSHAIR VIII IMPACT User Manual page 36

8. USB 2.0 connector
The USB 2.0 connector allows you to connect a USB module for additional USB
2.0 ports. The USB 2.0 connector provides data transfer speeds of up to 480 MB/s
connection speed.
DO NOT connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
The USB 2.0 module is purchased separately.
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Chapter 1: Product Introduction